Method of and apparatus for the manufacture of cement pipes.



No. 674,296. Patented may i4. 190|. c. J. KIELBERG. METHDDDF AND APPARATUS FOB THE MANUFACTURE DF. GEMENT PIPES.

(Application led Aug. 30, 1900.)

(No Model.)

CARL JOHAN KIELBERG,

' PATENT OFFICE.

0E HILLERD, DENMARK.

METHOD OF'AND APPARATUS FOR THE MANUFACTURE 0F CEMENT PIPES.

SPECIFICATION forming part of Letters Patent No. 674,296, dated May 14, 1901. Application filed August 30, 1900. Serial No. 28,598. (No modelJ To all whom t may concern.:

Beit known that I, CARL JOHAN KIELBERG, a subject of the King of Denmark, residing at Hillerd, Denmark, have invented certain new and useful Improvements in Methods of and Apparatus for the Manufacture of Cement Pipes; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the'art to which it appertains to make and use the same, reference being had to the accompanying drawing, and to letters of reference marked thereon, which form a part of this specification.

This invention relates to devices for molding and forming pipes from hydraulic or other similar cement or plastic material preparatory to completing the same by drying or baking them in ovens; and the invention is in the nature of an improvement upon the devices shown and described in Letters Patent of the United States issued to me on September 18, 1900, and numbered 658,067, the object of the invention being to provide an improved device of this class whereby pipes of an improved quality are produced; and the invention consists in the peculiar construction and arrangement of the several operative elements of the device whereby the pipes are molded, all as hereinafter fully described, and more particularly pointed out in the claim.

In the single figure of the drawing, forming part of this specification, is illustrated, partly in section and partly in side elevation, a device for molding and forming pipes from plastic material, constructed according to my invention. l

Referring to the drawing, e indicates a base for the machine, of stone or of cast-iron, in the upper surface of which is a circular groove t' between the border of the base and an upstanding circular rib g thereon. Said base forms a support for the below-described operative elements of the device, of which la is the inner and a the outer molding-case, both of which are of metal and of cylindrical form, as shown. Said inner case It is of uniform diameter from end to end, and it is supported in a vertical position on said base by the engagement of its lower end with the inner vertical face of said rib g, and its length is substantially coequal with that of lsaid outer case, as shown. The degree of separation of the adjoining Walls of said molding-case parts a and kabove or beyond the pipe-socketenlargement m on the lower end of the outer molding-case a determines the thickness of the pipe made or molded. The said enlargement m of the lower end of said outer case serves to produce a socket thereon, as usual, for receiving one end of an adjoining pipesection when the pipes are laid for use. The two cases a and 7c are separable from the base e, when desired, for removing a molded pipe therefrom.

Means are provided for compressing and solidifyi ng the cement or other material,which is placed in the spacen while it is being molded into pipe form, comprising a cylindrical compresser b, supported to rotate and to move vertically on said central case k, on thesurface of which compressor is fixed a continuous spirally-extending band d, on which is a laterally-projecting lip having a width from end to end of substantially that of the space 'n between the inner wall of said case a, and the surface of said compressor b, as shown. A head h is fixed to the outer end of said compressor, and to said head is connected a shaft ffor such connection with any suitable driving devices as causes the same andsaid cornpressor to be rotated and which permits the latter, together with said shaft, to move vertically on said central case 7c, as below described. t

The operation of the within-described devices in molding pipes of the class described is as follows: The operative parts of the device being in the relative positions shown in the drawing and the compressor b being rotated, as described, cement or other plastic material of which the pipe is to be formed is fed through the upper endof the outer case a into the space n and dropping downward becomes engaged by the said lip of the spiral band d and thereby, under the weight of the compressor and its connected parts and the compressing action of saidspiral lip, said cement is forced downward, filling first the part of said space n at and near the lower ends of the inner and outer molding-cases k and a, thus gradually filling said space from the lower end at the base e of the machine upwardly to the full length of the said cases IOO c and a, or less, if shorter pipes are required. The pipe having been thus molded, the compressor l?) is drawn upwardly clear of the parts containing the pipe. If deemed desirable to give the interior surface a smooth finish, the inner molding-case may be revolved more or less by any suitable means, preferably after the pipe shall have been fully molded. When the molding of the pipe is completed, the said compressorb, owing to the action of said spirally-extending band upon the cement within said space n, will, as aforel said, be lifted clear, or nearly so, of the upper end of the outer case a, and it is by any suitable device connected with the shaft ffurther drawn upward quite away from said case, and to insure a partial drying of the molded pipe without any deformity it is preferred to let the same remain on the base and between the case 7i: and the outer tube for a short time, and another base and inner and outer case are provided for use With the compressor b, and the work then proceeds as before.

Having thus described my invention, what l claim, and desire to secure by Letters Patent of the United States, is-

A device for molding pipes from plastic material comprising the inner molding-case k, and the outer molding-case a, both ot' said cases of cylindrical form; said outer case having an enlargement m around the lower end thereof, a base supporting said two cases vertically, one within the other, whereby a space is provided therebetween in which a pipe may be molded, a rotatable cylindrical compressor inclosing said inner molding-case, a spirallyarranged lip liXed on said compressor and extending continuously nearly around the same and across said space from end to end, toward the inner wall of said outer case, and a shaft for connection with suitable driving mechanism fixed on the upper extremity of said com# pressor and movable vertically therewith, whereby the latter may be rotated, substantially as described.

In testimony that I claim lthe foregoing as my invention I have signed my name in presence of two subscribing witnesses.

CARL JOHAN KIELBERG.

Witnesses:

J. DRAMINSKY, FLEISGHER. 

